Benchmark: Some vs. Filter vs. lodash findIndex

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>

Script Preparation code:

var hasZero = [];
var withoutZero = [];
for (var i = 0; i < 10000; i++) {
  var objWithZero = {
    key: Math.floor(Math.random() * 1000)
  }
  var objWithoutZero = {
    key: Math.floor(Math.random() * 1000) + 1
  }
  
  hasZero.push(objWithZero);
  withoutZero.push(objWithoutZero)
}

Tests:

Array.some
var tempResult = !!Math.round(Math.random()) ? hasZero.some(v => v.key === 0) : withoutZero.some(v => v.key === 0);
Array.filter
var tempResult = !!Math.round(Math.random()) ? hasZero.filter(v => v.key === 0) : withoutZero.filter(v => v.key === 0);
Array.indexOf
var tempResult = !!Math.round(Math.random()) ? _.findIndex(hasZero, function(o) { return o === 0; }) : _.findIndex(withoutZero, function(o) { return o === 0; });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.some
Array.filter
Array.indexOf

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**What is tested?**

The benchmark tests three different ways to check if an array contains an element with a specific property (in this case, `key === 0`). The properties being compared are:

1. **Array.prototype.some()**: This method returns true if at least one element in the array passes the test implemented by the provided function.
2. **Array.prototype.filter()**: This method creates a new array with all elements that pass the test implemented by the provided function.
3. **Lodash's _.findIndex()**: This function returns the index of the first element in the array that satisfies the provided condition, or -1 if no elements satisfy the condition.

**Options compared**

The benchmark compares the performance of these three approaches:

* **Pros and Cons:**
	+ Array.prototype.some(): Pros - simple, efficient (average O(n) time complexity). Cons - may return false positives if the test function is not strict enough.
	+ Array.prototype.filter(): Pros - can be used to create a new array with filtered elements. Cons - creates additional memory allocation and copy operations, which can impact performance in some cases.
	+ Lodash's _.findIndex(): Pros - provides a robust and consistent way to find the first element that matches the condition. Cons - requires an external library (Lodash) and may have a slightly higher overhead due to the function call.
* **Other considerations:**
	+ In general, Array.prototype.some() is a good choice when you need to check if at least one element in the array satisfies a condition.
	+ Array.prototype.filter() is useful when you want to create a new array with filtered elements.
	+ Lodash's _.findIndex() is suitable when you need a robust and consistent way to find the first element that matches a condition.

**Library: Lodash**

Lodash (pronounced "lodash") is a popular JavaScript library that provides a collection of high-quality, reusable functions for various tasks. In this benchmark, Lodash's _.findIndex() function is used to compare with Array.prototype.some() and Array.prototype.filter(). The _.findIndex() function is designed to find the first element in an array that satisfies a condition, and it returns -1 if no elements satisfy the condition.

**Special JavaScript feature/syntax: None**

There are no special JavaScript features or syntaxes being tested in this benchmark. All tests use standard JavaScript syntax and do not rely on any advanced features like async/await, promises, or ES6 classes.

I hope this explanation helps you understand what's being tested in the MeasureThat.net benchmark!

Related benchmarks:

Some vs. Filter vs. lodash findIndex (version: 0)

Comparing performance of: Array.some vs Array.filter vs Array.indexOf

Created: 5 years ago by: Guest

Jump to the latest result

Array.some

Array.filter

Array.indexOf

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):